I would recommend you contacting your hunting outfitter or PH to make arrangements with them to keep your firearm for you in a gun safe while you do your touring. If it is not convenient for them or you due to logistics, they might also have friends or relatives in Windhoek who may be able to accommodate your firearm safe keeping. they should be able to work something out for you... You may also consider contacting a gun shop and ask if they would consider accommodating your firearm in safe storage.